How_RRQ Animals_NN2 Think_VV0 Scrub_NN1 jays_NN2 can_VM trick_VVI you_PPY ,_, researchers_NN2 say_VV0 ._. 
Monkeys_NN2 kick_VV0 themselves_PPX2 for_IF mistakes_NN2 in_II judgment_NN1 ._. 
And_CC at_RR21 least_RR22 one_MC1 parrot_NN1 figured_VVD out_RP something_PN1 close_RR to_II the_AT mathematical_JJ concept_NN1 of_IO zero_NN1 ._. 
Animals_NN2 can_VM be_VBI remarkably_RR devoted_JJ --_NN1 as_II the_AT stories_NN2 on_II these_DD2 pages_NN2 prove_VV0 ._. 
What_DDQ 's_VBZ less_RGR obvious_JJ is_VBZ how_RRQ smart_JJ they_PPHS2 are_VBR ._. 
In_II study_NN1 after_II study_NN1 over_II the_AT past_JJ decade_NNT1 ,_, they_PPHS2 've_VH0 shown_VVN abilities_NN2 previously_RR thought_VVN to_TO exist_VVI only_RR in_II humans_NN2 ._. 
Take_VV0 the_AT scrub_NN1 jays_NN2 ._. 
A_AT1 few_DA2 years_NNT2 ago_RA ,_, Cambridge_NP1 University_NN1 professor_NN1 Nicky_NP1 Clayton_NP1 ,_, PhD_NNA ,_, found_VVD that_CST these_DD2 birds_NN2 can_VM be_VBI surprisingly_RR devious_JJ ,_, remembering_VVG not_XX only_RR what_DDQ foods_NN2 they_PPHS2 've_VH0 hidden_VVN but_CCB where_RRQ ,_, how_RRQ long_RR ago_RA ,_, and_CC whether_CSW anyone_PN1 else_RR might_VM have_VHI noticed_VVN ._. 
"_" If_CS another_DD1 bird_NN1 was_VBDZ watching_VVG ,_, they_PPHS2 'd_VM wait_VVI until_CS that_DD1 bird_NN1 was_VBDZ gone_VVN and_CC then_RT move_VV0 the_AT food_NN1 ,_, "_" Clayton_NP1 says_VVZ ._. 
